Publication Laka-library:
Draft air pathway report. Phase I of the Hanford Environmental Dose
| Author | Pacific Northwest Laboratory |
| Date | |
| Classification | 3.01.8.43/24 (UNITED STATES - SITES - HANFORD) |
| Front | 
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From the publication:
ABSTRACT This report summarizes the air pathway portion of the first phase of the Hanford Environmental Dose Reconstruction (HEDR) Project, conducted by Battelle staff at the Pacific Northwest Laboratory under the direction of an independent Technical Steering Panel. The HEDR Project is estimating historical radiation doses that could have been received by populations near the Department of Energy's Hanford Site, in southeastern Washington State. Phase I of the air-pathway dose reconstruction sought to determine whether dose estimates could be calculated for populations in the 10 counties nearest the Hanford Site from atmospheric releases of iodine-131 from the site from 1944-1947. Phase I demonstrated the following: • HEDR-calculated source-term estimates of iodine-131 releases to the atmosphere were within 20% of previously published estimates. • Calculated vegetation concentrations of iodine-131 agree well with previously published measurements. • The highest of the Phase I preliminary dose estimates to the thyroid are consistent with independent, previously published estimates of doses to maximally exposed individuals. • Relatively crude, previously published measurements of thyroid burdens for Hanford workers are in the range of average burdens that the HEDR model estimated for similar "reference individuals" for the period 1944-1947. Preliminary median dose estimates summed over the years 1945-1947 for the primary pathway, air-pasture-cow-milk-thyroid, ranged from low median values of 0.006 rad (0.00006 Gy) for upwind adults (4.5% of the Phase I population) who obtained milk from backyard cows not on pasture to high median values of 68.0 rad (0.68 Gy) for downwind infants who drank milk from pasture-fed cows (0.5% of the Phase I population). About 0.004% of the Phase I population was estimated to have received thyroid doses exceeding a previously published estimate (Washington State Department of Social and Health Services 1986) of 2,530 rem to a maximally exposed infant in Pasco, 1945-1947. Future work will expand the time, area, and radionuclides considered.
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